OFFSET
1,1
LINKS
Ray Ballinger, Proth Search Page
Ray Ballinger & Wilfrid Keller, List of primes k.2^n + 1 for k < 300.
PROG
(PARI) is(n)=ispseudoprime(241*2^n+1) \\ Charles R Greathouse IV, Jun 07 2017
CROSSREFS
KEYWORD
nonn,hard
AUTHOR
EXTENSIONS
One more term (from the Ballinger-Keller web page) from M. F. Hasler, Apr 18 2007
STATUS
approved